英文:
Modifying a struct type inside vendor files
问题
我必须修改一个供应商文件中的结构体。假设结构体在供应商文件中的样子是这样的：
type sampleStruct struct {
sampleStringvar1 string
sampleStringvar2 string
}
我需要添加一个字段，像这样：
type sampleStruct struct {
sampleStringvar1 string
sampleStringvar2 string
sampleBoolVar bool
}
我该如何实现这个目标？修改供应商变量是否是一个好的做法？如果不是，有什么更好的方法来实现这个目标？
英文:
I have to modify a struct inside a vendor file. Suppose this is how the struct is inside the vendor file
type sampleStruct struct {
sampleStringvar1 string
sampleStringvar2 string
}
I need to add one more field to it like this
type sampleStruct struct {
sampleStringvar1 string
sampleStringvar2 string
sampleBoolVar bool
}
How can I achieve this? Is it good practise to modify vendor variables like this? If not what is the best way to do this?
答案1
得分: 6
如果您不想分叉一个供应商库并用自己的库替换它，最佳做法是在您的项目中使用一个包装器。
包装器对象将是一个结构体：
- 引用一个
sampleStruct实例 - 具有一个
sampleBoolVar布尔值
即：
type MySampleStruct {
ss *sampleStruct
sampleBoolVar bool
}
这样，您可以在供应商库继续使用sampleStruct的同时，又可以从sampleBoolVar中受益。
但是，blackgreen在评论中指出：
> 如何在其自己的包之外引用一个未导出的结构体，就像sampleStruct一样？
这是正确的，上述建议不是关于公开一个私有变量，而是根据您从sampleStruct中观察到的内容来管理该变量。
根据库的行为，这可能是不可能的。
英文:
If you don't want to fork a vendored library and replace it with your own, the best practice would be, in your project, to use a wrapper.
The wrapper object would be struct:
- referencing a
sampleStructinstance - with a
sampleBoolVarboolean
That is:
type MySampleStruct {
ss *sampleStruct
sampleBoolVar bool
}
That way, you can benefit from sampleBoolVar while the vendored library keep using a sampleStruct as usual.
But, blackgreen points out in the comments:
> How would you be able to reference an unexported struct, as sampleStruct appears to be, outside its own package?
This is correct, and the aforementioned suggestion is not about exposing a private variable, but about managing that variable yourself, based on what you see from sampleStruct.
Depending on the library behavior, that might not be possible.
答案2
得分: 3
修改供应商变量是否是一个好的做法？
绝对不是。
如果不是的话，最好的方法是什么？
分叉供应商模块，并在你的 go.mod 文件中使用 replace 指令引用该分叉。
英文:
> Is it good practise to modify vendor variables like this?
Absolutely not.
> If not what is the best way to do this?
Fork the vendor module and reference the fork with a replace directive in your go.mod.
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